It's Asos being unhelpful. They are showing no interest in chasing the courier for me and didn't seem bothered that the courier has lied about attempting delivery. They basically said they can't help and seeing as I can only track it via their website (they won't give me the courier tracking number) that's useless IMO. The least they should be doing is contacting the courier company for information but instead they are only telling the same info I can see on the tracker.